Process for the production of calcium formate



Patented Mar. 26, 1935 9 5 7;

PROCESS FOR THE PRODUCTION OF CALCIUM FORMATE Max Enderli, Oestrich, Germany, assignor to firm Rudolph Koepp & Co. Chemische Fabrik A. G., Oestrich, Germany, a corporation of Germany No Drawing. Application August 9, 1933, Serial No. 684,399. In Germany August 13, 1932 5 Claims. (Cl. 260-114) A process is known for the production of alkaline earth formates by the action of carbon Partsofpotass ium monoxide or carbon monoxide-containing gases siumformte or f ggi gg iggg f on alkaline earths, for example caustic lime, at sodlummmate fcalcium oxide Potassmm Sd1um l form ate formate 5 elevated temperatures and at elevated pressures wherein the reaction is promoted by the presence Speed of reaction of alkali metal formates, not more than about-30 8 8 parts of an alkali metal formate being employed 9kg. 30 2 per 100 parts by weight of alkaline earth hy- E: 138 172 10 droxide. The alkali metal formates may be added 60 200 180k 6 0 265 240 as such or may be produced during the process g 0 from substances such as caustic alkalies, which B bl 1 f th are capable of forming under the conditions of y Sun a Se 60 1011 0 6 W01 lng con 1- the reaction alkali metal formates by fixing cartions the process be carried out in sllch hon monoxide manner that the calcium formate formed is obtained in the form of a suspension which can Accordin to an embodiment of this rocess the alkalin: earth hydroxide is employed as an fl y Separated. from the mothe.r hquor aqueous suspension or in the form of a paste, the g i Lhe i f fi gt which has been, reaction being carried out, if desired, by adding so 1 0 ,3 for te much alkaline earth formate that a saturated .cvan ageous y e assl ma solution is obtained from which the newly formed qu1red for the reaction is produced from caustic alkali and carbon monoxide in situ by starting ,g'flz earth formate can lmmedlately separate with a suspension of caustic lime in aqueous caus- It has now been found that in treating lime tic alkali in such a proportion that more than 30 in the form of an aqueous suspension or a liquid parts of an alkali metal formate per 100 parts of alkaline earth hydroxide are formed. aqueous paste the speed of reaction may be l further considerably increased by the presence The alkah metal formats containing mother of quantities of alkali metal formats greater than tlquor Can sepal'ated-dfriJm thicalcfilum fgrjmialte those hereinbefore referred to. This is of great m the usua' ggt g Ways t importance since when employing, as is usual, f q y a i fi s 9 z stirring apparatus, which permit of the use of co'lclum 6 W C 1S S 1 con ame m e be separated by only a limited excess pressure of carbon monoxide, f hqllor i 1f desuf'ed the speed of reaction of the process for the prog figgg ggg biore retummg the mother hquor duction of calcium formate is relatively small and w I 01min the emciency of the plant consequently not very great formate, comprising causing carbon monoxide to The advantageous effects of the present process act on Caustic lime in aqueous Suspension at are Obvious from the following comparative formate producing temperatures and pressures in 40 periments, in Which in each case 500 litres of a the presence of an alkali metal formate in quan- 6% mi k f l w treated under thorough tities of more than 30 parts per 100 parts of mixing with carbon monoxide at 185 C. under a c ustic 1ime partial pressure of 8 atms, increasing amounts of 2. A process for the production of calcium potassium or sodium formate being added as formate, comprising causing carbon monoxideaccelerators. If the measured speed of reaction containing gases to act on caustic lime in aqueous of the formation of calcium formate from caustic suspension at formate producing temperatures lime and carbon monoxide without any addition is and pressures in the presence of an alkali metal taken as 100 then the following comparative formate in quantities of more than 30 parts per values for the addition of alkali formate are 100 parts of caustic lime. found: 3. A process for the production of calcium 1. A process for the production of calcium 3 formate, comprising causing carbon monoxide to act on caustic lime in aqueous paste-like suspension at formate producing temperatures and pressures in the presence of an alkali metal formate in quantities of more than 30 parts per 100 parts of caustic lime.

4. A process for the production of calcium formate, comprising causing carbon monoxide to act on caustic lime at formate producing temperatures and pressures in the presence of an alkali metal formate in quantities of more than 30 parts per 100 parts of caustic lime, the concentrations being such that the calcium formate formed is obtained in solid form.

5. A process for the production of calcium formate, comprising causing carbon monoxide to act on caustic lime in aqueous suspension at formate producing temperatures and pressures in the presence of an alkali metal formate in quantities of more than 30 parts per 100 parts of caustic lime, under such conditions of concentration that the calcium Iormate formed is obtained in solid form, separating the calcium formate from the alkali metal iormate-containing mother liquor and returning the alkali metal formate-contalning mother liquor to the process.

MAX ENDERLI. 

